TS-4100 ADC: Difference between revisions
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This board supports | This board supports two 12-bit ADC inputs using the i.MX6UL CPU's integrated ADC. | ||
All of these inputs can sample 0- | All of these inputs can sample 0-3.3 VDC intrinsically or 4-20 mA with the necessary hardware in place. | ||
{{Note|An external resistor will need to be added in order to enable the 4-20 mA measurements.}} | |||
These ADCs are accessed through the [https://wiki.analog.com/software/linux/docs/iio/iio Linux Industrial I/O Subsystem] (IIO), which provides sample rates up to 6ksps across all inputs. | These ADCs are accessed through the [https://wiki.analog.com/software/linux/docs/iio/iio Linux Industrial I/O Subsystem] (IIO), which provides sample rates up to 6ksps across all inputs. | ||
The simplest API it offers for slow speed acquisition is via [https://en.wikipedia.org/wiki/Sysfs sysfs] (/sys): | The simplest API it offers for slow speed acquisition is via [https://en.wikipedia.org/wiki/Sysfs sysfs] (/sys): | ||
<source lang=bash> | <source lang=bash> | ||
cat /sys/bus/iio/devices/iio:device0/in_voltage{ | cat /sys/bus/iio/devices/iio:device0/in_voltage{1,9}_raw | ||
</source> | </source> | ||
| Line 12: | Line 14: | ||
! Schematic Name | ! Schematic Name | ||
! i.MX6UL ADC Signal | ! i.MX6UL ADC Signal | ||
! | ! CN2 Terminal Pin | ||
! IIO name | ! IIO name | ||
|- | |- | ||
| | | GPIO_1_ADC | ||
| | | ADC1_IN1 | ||
| | | 12 | ||
| | | voltage1 | ||
|- | |- | ||
| | | GPIO_9_ADC | ||
| ADC1_IN9 | | ADC1_IN9 | ||
| | | 91 | ||
| voltage9 | | voltage9 | ||
|} | |} | ||
{{Note|Each baseboards breakout implementation of these two ADC pins will differ.}} | |||
Latest revision as of 19:25, 15 June 2020
This board supports two 12-bit ADC inputs using the i.MX6UL CPU's integrated ADC. All of these inputs can sample 0-3.3 VDC intrinsically or 4-20 mA with the necessary hardware in place.
| Note: | An external resistor will need to be added in order to enable the 4-20 mA measurements. |
These ADCs are accessed through the Linux Industrial I/O Subsystem (IIO), which provides sample rates up to 6ksps across all inputs. The simplest API it offers for slow speed acquisition is via sysfs (/sys):
cat /sys/bus/iio/devices/iio:device0/in_voltage{1,9}_raw
The pin assignments and names for accessing each ADC input are:
| Schematic Name | i.MX6UL ADC Signal | CN2 Terminal Pin | IIO name |
|---|---|---|---|
| GPIO_1_ADC | ADC1_IN1 | 12 | voltage1 |
| GPIO_9_ADC | ADC1_IN9 | 91 | voltage9 |
| Note: | Each baseboards breakout implementation of these two ADC pins will differ. |